CFA Piling

Continuous flight auger (CFA) is a cast in-situ method of piling that drills the pile using a hollow stemmed continuous flight auger equivalent to the required pile depth.

The CFA pile is installed by drilling the hollow stemmed auger into the ground at a constant penetration rate. Upon reaching the design depth of the pile, concrete is pumped under pressure from a concrete pump through the hollow stemmed augers. Augers are then extracted at a controlled rate by means of an on-board computer system which relays all the necessary information needed to the operator in order to construct the pile. This information will include concrete pressure and volume, depth & extraction rate. During the controlled extraction process the auger is rotated in a forward direction so as to remove the material within the bore and prevent ground material entering the column of concrete. On completion of concreting, a pre- fabricated steel reinforcement cage is inserted into the fluid concrete.

Martello Piling have an in-house team who have many years of CFA experience. This system has been utilised to enhance our production rates on Secant Wall projects, by installing female wall piles prior to Martello MP 5000 Series rigs being mobilised to site to carry out the rotary element of the Secant Wall works.